/**
 * Software License, Version 1.0
 * 
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 * 
 *
 *Redistribution and use in source and binary forms, with or without 
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the 
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For 
 * further information contact the Community Grids Lab at 
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and 
 * wherever such third-party acknowledgments normally appear.
 * 
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering, 
 * shall not be used to endorse or promote products derived from this software 
 * without prior written permission from Indiana University.  For written 
 * permission, please contact the Advanced Research and Technology Institute 
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering, 
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 * 
 *
 * Indiana University provides no reassurances that the source code provided 
 * does not infringe the patent or any other intellectual property rights of 
 * any other entity.  Indiana University disclaims any liability to any 
 * recipient for claims brought by any other entity based on infringement of 
 * intellectual property rights or otherwise.  
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO 
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF 
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS. 
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS", 
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.  
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR 
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION 
 *GENERATED USING SOFTWARE.
 */
package cgl.narada.util;

import java.io.IOException;
import java.net.DatagramSocket;
import java.net.ServerSocket;

/** This retrieves the first available TCP and Datagram ports that are
    available for use 

    @author Shrideep Pallickara
    $Date$
    $Revision$
*/

public class PortRetriever {
  private static boolean PortRetriever_Debug=false;
  private static String moduleName="PortRetriever: ";

  public PortRetriever() {

  }


  public static int 
  retrieveAvailableTCPPortForSetup(int freePortNum) {
    ServerSocket tempServerSocket;
    int computedVal=0;
    for (int i= freePortNum; i < 64000 /**max port num allowed */; i++) {
      try {
	tempServerSocket = new ServerSocket(i);
	/** Once we reach here, we can proceed to return this portNum as the
	    port where a process could be created. */
	computedVal = i;
	tempServerSocket.close();
	return computedVal;
      } catch (IOException ioe) {
	/** This means there was a process running on this port, we simply
	    skip it. */
	if (PortRetriever_Debug) {
	  System.out.println("JmsTopicConnFactory: There exists a process " + 
			     "utilizing TCP port (" +  i + ")");
	}/*end-debug*/
      }/*end-try*/
    } /*end-for*/
    return computedVal;
    
  }
  
  public static int
  retrieveAvailableDatagramPort(int freePortNum) {
    DatagramSocket tempDatagramSocket;
    int computedVal=0;
    for (int i= freePortNum; i < 64000; i++) {
      try {
	tempDatagramSocket = new DatagramSocket(i);
	/** Once we reach here, this portNum could be used as the port where 
	    a process could be created. */
	computedVal = i;
	tempDatagramSocket.close();
	return computedVal;
      } catch (IOException ioe) {
	/** This means there was a process running on this port, we simply
	    skip it. */
	if (PortRetriever_Debug) {
	  System.out.println("JmsTopicConnFactory: There exists a process " + 
			     "utilizing UDP port (" +   i + ")");
	}/*end - debug*/
      }/*end-try*/
    } /*end-for*/
    return computedVal;

  }

  public static void main(String[] args) {
    
    for (int i= 3045; i< 10; i++) {
      System.out.println(PortRetriever.retrieveAvailableDatagramPort(i));
    }
    
  }
}
